Changes between Initial Version and Version 1 of Suggestions-Enhancements:

Timestamp:

Sep 29, 2011, 1:37:52 AM (13 years ago)

Author:

havatv

Comment:

--

Suggestions-Enhancements:

@@ +1 @@
+= Suggestions / Enhancements =
+
+---------
+
+== Improved support for dashed lines ==
+
+To improve the support of dashed lines in Mapserver, INITIALGAP needs to be added as a STYLE
+parameter and GAP needs to specify the centre to centre distance between points.
+
+=== Current support for dashed lines in Mapserver ===
+
+Dashed lines have "always" been supported by Mapserver. Currently (Mapserver 6.0) with the
+LAYER-> CLASS-> STYLE-> PATTERN parameter.
+
+{{{PATTERN <length1> <gap1> <length2> <gap2> ... END}}}
+
+The pattern is repeated until the end of the line is reached.
+
+=== Support for styling of dashed lines with point symbols ===
+
+Lines can be styled with point symbols using the LAYER-> CLASS-> STYLE-> GAP parameter,
+which places point symbols along a line with a spacing given by GAP. Currently, dashed lines can not
+be styled in this way. It is not possible to make the signature in the figure with Mapserver:
+In order to support this kind of signature (which is used on orienteering maps), it must be possible to
+specify the gap to the first symbol on the line separately. For instance using INITIALGAP (as used in
+SLD), as suggested in Mapserver ticket #3879. Using INITIALGAP, the signature can be specified
+as follows:
+
+{{{
+STYLE # DASHED LINE
+  COLOR 0 0 0
+  WIDTH 0.1
+  PATTERN 2.25 0.25 END
+END
+STYLE # POINTS
+  SYMBOL "circlef"
+  COLOR 0 0 0
+  SIZE 0.4
+  INITIALGAP 1.125
+  GAP 2.5
+END
+}}}
+
+To simplify this kind of styling, it is also important that the GAP value specifies the centre to centre
+distance between the points (as suggested in Mapserver ticket #3867).
+
+=== Support for styling of dashed lines with dashed lines ===
+
+Lines can be styled with dashed lines by overlay (STYLE on STYLE). But styling of dashed lines
+with dashed lines is currently not possible. In order to make this possible it is necessary to specify a
+gap to the start of the pattern, for instance using INITIALGAP, as used for point symbols.
+
+[[Image()]]
+
+{{{
+STYLE
+  COLOR 0 0 0
+  WIDTH 0.2
+  PATTERN 2.25 0.25 END
+END
+STYLE
+  COLOR 255 255 255
+  WIDTH 0.1
+  INITIALGAP 0.5
+  PATTERN 1.25 1.25 END
+END
+}}}
+
+---------